AM Best Assigns Credit Ratings to MMIC Risk Retention Group, Inc. AM Best Assigns Credit Ratings to MMIC Risk Retention Group, Inc. AM Best has assigned a Financial Strength Rating of A (Excellent) and the Long-Term Issuer Credit Rating of a to MMIC Risk Retention Group, Inc. (MMIC RRG) (Washington D.C.). The outlook assigned to these Credit Ratings is stable. MMIC RRG is a sponsored risk retention group of Constellation, Inc., the parent company of MMIC Insurance, Inc., which is the lead member of Constellation Insurance Group (Constellation). The ratings of MMIC RRG reflect the consolid...